Remake texttures on some 3D models so they look photo realistic in Unity 3D

I bought some 3d models on CG Trader and they don't look realistic when put into unity. There are missing textures. I need these models to have the textures recreated in unity so they display as photo realistic.
One example.
Model I bought:
https://www.cgtrader.com/3d-models/interior/house/large-mansion-2021-blender-eevee-and-cycles-1

How it looks in unity:
https://drive.google.com/file/d/1PqQTjuGxjQEYhixLgKgj7XmAcSdnDQJo/view?usp=sharing